Difference between defer and async in javascript?

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Difference between defer and async in javascript?

Postby John » Mon Apr 07, 2014 11:02 am

Difference between defer and async in javascript?
John Abraham
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Re: Difference between defer and async in javascript?

Postby John » Mon Apr 07, 2014 11:03 am

 Normal execution <script>
This is the default behavior of the <script> element. Parsing of the HTML code pauses while the script is executing. For slow servers and heavy scripts this means that displaying the webpage will be delayed.
 Deferred execution <script defer>
Simply put: delaying script execution until the HTML parser has finished. A positive effect of this attribute is that the DOM will be available for your script. However, since not every browser supports defer yet, don’t rely on it!
 Asynchronous execution <script async>
Don’t care when the script will be available? Asynchronous is the best of both worlds: HTML parsing may continue and the script will be executed as soon as it’s ready. I’d recommend this for scripts such as Google Analytics.
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